The safest way to detangle wet hair is generally to:

Wet hair is more fragile and prone to stretching and breakage, so the safest way to detangle it is generally to start gently at the ends and work upward toward the roots, using a wide-tooth comb or appropriate detangling tool, easing through knots rather than forcing. Starting at the roots and yanking down drives tangles into a tighter knot and causes breakage. Gentle, end-first detangling protects the hair. This practical, hair-health-minded technique is the type of detail covered in the styling content.